You can specify more than one keyword per command.
If a keyword is specified more than once, only the
last one is executed.
Keywords that describe long time periods (YEAR, QUARTER, MONTH) cannot be used on the
same command with keywords that describe short time periods (WEEK, DAY, HOUR, MINUTE, SECOND).
Keywords CYCLE and OBS can be used with any
other keyword.
The lowest-order keyword specified should correspond
to the level at which observations occur. For example, if observations
are daily, the lowest-order keyword should be DAY.
Keywords (except MINUTE) can be abbreviated down to the first character. MINUTE must have at least two characters
(MI) to distinguish it from keyword MONTH.
Keywords and additional specifications are separated
by commas or spaces.